JP2017105254A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a change in the shape of a center pillar while reducing costs required for multi-functionalization.SOLUTION: A work vehicle comprises a motive power unit 2 on a vehicle body front side, an operation part 4 on a vehicle body rear side, a battery 5 arranged between the motive power unit 2 and the operation part 4, a base frame 12 on a vehicle body lower side, and a center pillar 13 extending upward from the base frame 12. The motive power unit 2 comprises a radiator 20 immediately before the center pillar, and the operation part 4 comprises a steering wheel 31 above the battery 5. The center pillar 13 has an integral structure in which a partition wall 40 made of a steel plate that divides longitudinally a storage space of a vehicle body front into a motive power unit side and a battery side, a first support member 41 made of a steel plate and supporting the partition wall 40 from below, a second support member 42 made of a steel plate and supporting the radiator 20 from below, a third support member 43 made of a steel plate and supporting the steering wheel 31, and a mounting table 44 for placement of the battery 5 are welded.SELECTED DRAWING: Figure 3

Description

  The present invention includes a vehicle body frame, a driving unit disposed on the front side of the vehicle body, a driving unit disposed on the rear side of the vehicle body, and a battery disposed between the driving unit and the driving unit. It is related with the work vehicle provided.

A tractor, which is an example of a work vehicle, includes a center pillar (frame structure) having a three-part structure having an aluminum die-cast partition wall portion and left and right support frame portions. With this center pillar, a storage space at the front of the vehicle body is provided. There is one that is divided forward and backward into a first space on the driving unit side and a second space on the battery side (see, for example, Patent Document 1).
In this tractor, the center pillar made of aluminum die casting is divided into three parts, so that a step support part that supports the left and right front end parts of the boarding step, a battery support part, and a mounting seat that supports the hydraulic controller for power steering The center pillar can be integrated with the center pillar so that the center pillar can be multi-functional.

JP 2011-126531 A (paragraph numbers 0013, 0020-0025, FIG. 2, FIGS. 6-10)

  In the above configuration, in order to increase the functionality of the center pillar, three types of molds for the partition wall portion, the left support frame portion, and the right support frame portion are required. The manufacturing cost required increases. In addition, since the shape of the center pillar is restricted from the point of mold release, it becomes difficult to change the shape of the center pillar according to the change or addition of peripheral devices supported by the center pillar.

  That is, it is desired to make it easy to change the shape of the center pillar while reducing the manufacturing cost required for multifunctional center pillars.

As means for solving the above problems, a work vehicle according to the present invention is:
A vehicle body frame, a driving unit disposed on the front side of the vehicle body, a driving unit disposed on the rear side of the vehicle body, and a battery disposed between the driving unit and the driving unit,
The vehicle body frame includes a base frame disposed on a lower side of the vehicle body, and a center pillar extending upward from the base frame between the driving unit and the driving unit,
The prime mover unit includes a radiator disposed immediately before the center pillar,
The driving unit includes a steering wheel disposed above the battery,
The center pillar includes a steel plate partition that divides a storage space formed in a front portion of the vehicle body into a first space on the driving unit side and a second space on the battery side, and a steel plate that supports the partition wall from below. A first support member made of steel, a second support member made of steel plate that supports the radiator from below, a third support member made of steel plate that supports the steering wheel, and a steel plate mounting on which the battery is placed It is comprised by the integrated structure with which the stand was welded.

According to this means, the center pillar functions as a partition wall of the storage space, a support member for the radiator, a support member for the steering wheel, and a mounting table for the battery.
Since the center pillar is a welded integrated structure made of a steel plate that does not require a die, the die cost can be eliminated compared to the case where the center pillar is made of aluminum die casting that requires a die, for example. At the same time, it becomes easy to change the shape of the center pillar according to the change or addition of peripheral devices supported by the center pillar.

  As a result, while reducing the manufacturing cost required for multi-functionality of the center pillar, the center pillar is suitable for multi-functionality that can be easily changed in shape according to changes or additions of peripheral devices supported by the center pillar. Can be a thing.

As one of the means for making the present invention more suitable,
The mounting table has a front end portion that extends forward of the first support member and is also used as the second support member.

  According to this means, the configuration can be simplified by reducing the number of parts in the center pillar as compared with the case where the center pillar is provided with a dedicated steel plate material constituting the second support member.

As one of the means for making the present invention more suitable,
The partition wall is formed in a frame shape in which a vent hole for a radiator is formed in the center, and an extension portion extending backward from an upper edge portion of an inner peripheral edge forming the vent hole is bent and formed.
An upper portion of the third support member is welded to the extension portion.

  According to this means, since the steel plate portion at the center of the partition that is not required when forming the ventilation port is effectively used for welding with the upper portion of the third support member, the welding between the partition and the third support member is used for the third support member. This can be carried out firmly without increasing the length of the upward extension.

As one of the means for making the present invention more suitable,
The third support member is positioned behind the ventilation port in an assembly posture in which each plane does not face the ventilation port.

  According to this means, it is possible to prevent a decrease in the air flow rate with respect to the radiator due to the fact that each plane of the third support member faces the ventilation port of the partition wall.

As one of the means for making the present invention more suitable,
The center pillar includes a fourth support member made of a steel plate that supports the third support member in a state of being supported by the base frame,
The fourth support member is bent and formed in an inverted U shape straddling the battery from side to side in an assembly posture in which each plane does not face the ventilation port,
The lower end of the third support member is welded to the upper surface of the fourth support member.

According to this means, the third support member is supported by the base frame via the highly stable fourth support member having a wide left-right width across the battery. And, for example, compared with the case where the third support member is directly supported by the base frame, the vertical length of the third support member is shortened, so the strength and stability of the third support member are increased. .
As a result, the steering wheel can be supported by the third support member with high strength and good stability.

  In addition, it is possible to prevent a decrease in the amount of air flow to the radiator due to the fact that each plane of the fourth support member faces the ventilation port of the partition wall.

As one of the means for making the present invention more suitable,
The left and right upper portions adjacent to the positive terminal of the battery are formed asymmetrically left and right so that the fourth support member is farther from the terminals toward the vehicle body side than the other left and right upper portions adjacent to the negative terminal of the battery.

  According to this means, it is possible to prevent the inconvenience that the positive terminal of the battery comes into contact with the upper portion of the fourth support member and is short-circuited when the battery is attached to or detached from the rear.

As one of the means for making the present invention more suitable,
The vehicle body frame includes a fixing mechanism that fixes the battery on a mounting table,
The fixing mechanism includes left and right rods supported on both left and right sides of the fourth support member so as to be vertically swingable, a pressing member that is slidably mounted on the left and right rods, and left and right rods. A left and right first nut attached to a male screw portion formed at the free end, and a fixing position where the pressing member contacts a corner of the upper front end of the battery; and the pressing member is a lower end of the battery The swinging operation over the retracted position located behind the unit is possible.

According to this means, when the battery is fixed at a predetermined position on the mounting table, the operator moves the battery to the predetermined position on the mounting table, and then places the fixing mechanism at the fixed position in the left and right direction. By performing the tightening operation of the first nut, the battery can be fixed at a predetermined position on the mounting table while being pressed against the mounting table by the pressing member.
Further, when removing the battery from the predetermined position on the mounting table, the operator can release the pressing of the battery to the mounting table by the pressing member by performing the tightening release operation of the first nuts on the left and right. The fixing mechanism can be oscillated and displaced from the fixing position to the retracted position. Then, by swinging and moving the fixing mechanism to the retracted position, it is possible to easily carry out the battery from the mounting table to the rear without causing the inconvenience of the fixing mechanism.

As one of the means for making the present invention more suitable,
The center pillar includes a steel plate reinforcing member that extends from the first support member to the third support member in an assembly posture in which each plane does not face the ventilation port.
The reinforcing member has a lower end welded to the first support member and an upper end welded to the third support member.

  According to this means, it is possible to reinforce the center pillar while preventing a decrease in the air flow rate to the radiator due to the fact that each plane of the reinforcing member faces the ventilation hole of the partition wall.

As one of the means for making the present invention more suitable,
The radiator is provided with a dustproof net that can be removed upward on the back,
In the partition wall, a guide portion that guides dust falling downward from the dust-proof net to the lower side of the radiator is bent and formed in a rearward rising posture extending rearward and upward from the lower edge portion of the inner peripheral edge.

According to this measure, while effectively using the central steel plate part of the partition that is not required when forming the ventilation openings, it is possible to suppress the inconvenience that dust falling from the dustproof net flows into the center pillar from the ventilation openings and accumulates. can do.
In addition, the lower side of the partition wall can be reinforced without adding a new reinforcing member, and the strength of the center pillar can be increased.

As one of the means for making the present invention more suitable,
A transmission unit disposed on the rear side of the vehicle body, and a transmission shaft that is transmitted from the output unit of the driving unit to the input unit of the transmission unit through the lower side of the radiator,
The center pillar includes left and right legs supported by the top plate of the base frame, and forms a space for transmission shaft arrangement with the top plate,
In the top plate, an opening that allows the transmission shaft to enter when the transmission shaft is attached and detached is formed on the front side of the top plate located below the radiator,
In the mounting table, a recess that allows the transmission shaft to enter when the transmission shaft is attached and detached is formed from the rear end of the mounting table to the front.

According to this means, when the transmission shaft is inserted into and removed from the space between the top plate and the center pillar, the operator uses the opening of the top plate and the recessed portion of the mounting table to thereby transmit the transmission shaft. The posture can be easily changed to a rearward tilting posture for insertion and removal and a horizontal posture for transmission connection without being obstructed by the top plate and the mounting table.
As a result, the transmission shaft can be easily inserted into and removed from the space between the top plate and the center pillar from above the top plate.

As one of the means for making the present invention more suitable,
A tilt unit that supports the steering wheel so as to be swingable in the vertical direction;
The tilt unit includes a swinging member that swings integrally with the steering wheel about a first support shaft that is directed to the left and right, a gas spring that assists a swinging operation of the swinging member, and a vertical movement of the swinging member. An operating lever that is operated over a locking position that prevents swinging and a release position that allows vertical swinging;
The third support member includes a first support portion that supports the swinging member via the first support shaft, a left-right fulcrum shaft that supports one end of the gas spring so as to be relatively swingable, and And a second support portion that supports the operation lever so as to be swingable.

According to this means, the driver can easily adjust the height of the steering wheel in accordance with the physique of the driver and the like by performing the swinging operation of the operation lever and the swinging operation of the steering wheel.
Further, the third support member of the center pillar can also be used as a support member that supports the tilt unit. As a result, for example, as compared with a case where a dedicated support member for supporting the tilt unit is newly provided, the center pillar can be multi-functional while simplifying the configuration by reducing the number of parts.

As one of the means for making the present invention more suitable,
The operation lever is supported on the first support shaft so as to be relatively swingable.

According to this means, the number of parts required for the construction of the tilt unit can be reduced as compared with a case where a dedicated support shaft for supporting the operation lever is provided.
Further, since the first support portion also serves as the second support portion, the center pillar can be multi-functional while simplifying the configuration of the center pillar.

As one of the means for making the present invention more suitable,
It has a hydraulic power steering unit,
The power steering unit includes a hydraulic control unit supported by the swing member, a hydraulic hose connected to the hydraulic control unit, and a metal hydraulic pipe connected to the hydraulic hose,
The center pillar is provided with a rubber holder for holding the hydraulic pipe at its lower end.

According to this means, the resonance of the hydraulic pipe can be prevented.
In addition, the connection point between the hydraulic hose and the hydraulic pipe can be set at a low position away from the hydraulic control unit, so that the integral swing with the swinging member of the hydraulic control unit when adjusting the height of the steering wheel can be performed. The length of the hydraulic hose that allows movement can be increased. As a result, the height adjustment range of the steering wheel can be widened.

As one of the means for making the present invention more suitable,
The center pillar includes a mounting portion in which a long hole for positioning is formed at a lower end portion of the center pillar,
The holder is formed with a fitting groove into which the hydraulic pipe is fitted from above on its upper surface, and a ridge that is fitted into the elongated hole from above with its bottom surface.

According to this means, when the operator installs the hydraulic pipe at a predetermined position of the center pillar, the holder is prevented from being displaced in the horizontal direction by fitting the protrusion of the holder into the elongated hole of the mounting portion. It can be mounted on the mounting part in the state where it was done. Then, after the placement, the protrusion of the holder can be prevented from coming off from the long hole of the placement portion by fitting the hydraulic pipe into the fitting groove of the holder from above.
As a result, it is possible to fix and hold the hydraulic pipe at a predetermined position of the center pillar in a state in which resonance is prevented by the holder while improving the assemblability of the hydraulic pipe.

As one of the means for making the present invention more suitable,
The center pillar includes left and right side walls made of steel plates disposed on the left and right sides of the partition wall,
The left and right side walls have their lower ends welded to the first support member, and their inner side surfaces welded to the lateral ends of the partition walls.

  According to this means, the strength of the center pillar can be increased.

As one of the means for making the present invention more suitable,
A U-shaped under panel in plan view that covers the battery from behind,
The left and right side walls are welded to the left and right positioning members made of steel plates bent and formed in a U shape to form a vertically long slit between the outer side surfaces thereof,
The under panel includes a vertically long insertion portion that is inserted into the slit at left and right front end portions thereof.

According to this means, when the operator assembles the under panel at a predetermined assembling position, the operator inserts the left and right insertion portions of the under panel into the slits on the left and right side walls so as to correspond to the predetermined assembling position of the under panel. Positioning can be performed easily.
Further, since the left and right side walls of the center pillar also serve as the positioning member for the under panel, the center pillar can be multi-functional.

As one of the means for making the present invention more suitable,
The left and right positioning members have their upper end portions inclined upward and rearward, and their lower end portions inclined downward and the inner surface of the upper end portion and the inner surface of the lower end portion vertically move the insertion portion. It is formed in the 1st guide surface which carries out positioning guidance.

  According to this means, the operator can easily and accurately position the under panel in the vertical direction with respect to a predetermined assembly position.

As one of the means for making the present invention more suitable,
The left and right positioning members are inclined so that their intermediate portions are separated from the side wall toward the rear side, and the inner surface of the intermediate portion is formed as a second guide surface for positioning and guiding the insertion portion in the left-right direction. Yes.

  According to this means, the operator can easily and accurately position the under panel in the left-right direction with respect to a predetermined assembly position.

As one of the means for making the present invention more suitable,
A bonnet that swings up and down over a closed position that covers the prime mover unit and an open position that exposes the prime mover unit;
The left and right side walls are inclined rearward so that their front end edges are located on the rear side of the vehicle body,
The bonnet is provided with seal support portions on the left and right inner surfaces thereof,
The left and right seal support portions have rear end edges that are inclined rearwardly at the same inclination angle as the left and right front end edges and face the left and right front end edges in the closed position, and the left and right rear end edges, In the closed position, left and right seal members that are in line contact with the left and right front end edges are provided across the upper and lower ends of the left and right front end edges.

  According to this means, for example, compared to a case where the front end edges of the left and right side walls and the rear end edges of the left and right seal support portions are provided in a vertical posture, the left and right side walls at the closed position of the bonnet and The degree of adhesion with the seal member can be easily increased.

As one of the means for making the present invention more suitable,
The center pillar includes left and right guide plates extending forward from the left and right side walls,
The left and right guide plates are formed so as to contact the left and right inner surfaces of the bonnet and guide the bonnet to a predetermined position in the left-right direction when the bonnet is closed.

  According to this means, at the time of closing the bonnet, the left and right seal members on the bonnet side can be accurately positioned at appropriate positions in the left-right direction with respect to the front end edges of the left and right side walls. As a result, the left and right sealing members can be surely brought into line contact with the front end edges of the left and right side walls.

As one of the means for making the present invention more suitable,
A bonnet that swings up and down over a closed position that covers the prime mover unit and an open position that exposes the prime mover unit;
The bonnet includes left and right leaf springs that are in surface contact with the outer side surfaces of the left and right side walls across the upper and lower end portions of the left and right side walls at the closed position on the left and right inner surfaces thereof,
The left and right leaf springs are formed such that their rear edge portions are located on the outer side of the vehicle body toward the rear side.

According to this means, at the time of closing the bonnet, the rear end edges of the left and right leaf springs come into contact with the outer surfaces of the left and right side walls, whereby the bonnet can be positioned in the left-right direction with respect to the center pillar.
In the closed position of the bonnet 8, the left and right leaf springs are in surface contact with the left and right side walls as described above, so that the bonnet and the left and right side walls can be connected without using a low-durability rubber trim or the like. The possibility of unnecessary gaps being formed between them can be avoided over a long period of time.

As one of the means for making the present invention more suitable,
An upper panel that covers the upper part of the center pillar from above;
The upper panel has its front end covered from above at the rear end of the bonnet in the closed position,
In the center pillar, an upper portion of the partition wall is inscribed in a front end portion of the upper panel.

According to this means, for example, if the front end of the upper panel and the rear end of the partition wall are adjacent to each other in the front-rear direction, and the front end of the partition wall and the rear end of the bonnet at the closed position are adjacent to each other in the front-rear direction, In order to make the gap between adjacent end faces look good and constant, it is necessary to increase the finishing accuracy of these adjacent end faces.
On the other hand, with this means, since the gap between the adjacent end faces cannot be seen from the outside, the appearance of the vicinity of the rear end of the bonnet can be improved without increasing the finishing accuracy of the adjacent end faces.

As one of the means for making the present invention more suitable,
A lock mechanism for fixing and holding the bonnet in the closed position;
The lock mechanism includes a hook member that swings between a lock position and a release position, a spring that urges the hook member back to the lock position, and the hook member that resists the action of the spring to the release position. An operation rod that enables a swing operation, and a rod on which the hook member at the lock position is hooked;
The partition wall includes a third support portion that supports the hook member and the spring, and a fourth support portion that supports the operation rod so that the operation rod can be operated.

  According to this means, since the partition of the center pillar also serves as a support member of the lock mechanism, compared with a case where a support member dedicated to the lock mechanism is individually provided, while simplifying the configuration by reducing the number of parts, etc. The center pillar can be multi-functional.

As one of the means for making the present invention more suitable,
The fourth support portion is integrally formed with a connecting portion to which an upper panel that covers the upper portion of the center pillar from above is connected.

  According to this means, the configuration can be simplified by reducing the number of parts as compared with the case where the fourth support portion and the connecting portion are individually provided in the partition wall.

As one of the means for making the present invention more suitable,
A cooling fan disposed immediately before the radiator, an air cleaner disposed in front of the radiator and above the cooling fan, and a fan shroud extending from the partition wall to the cooling fan,
The fan shroud has an air passage forming portion for forming an air passage between the upper portion of the partition wall and the upper portion of the partition wall,
The partition wall is formed with air holes that allow air to flow into the air passage on the left and right end sides of the upper part,
The vent passage forming portion is formed with a connection hole for connecting the vent passage to the intake portion of the air cleaner on the left and right other ends of the vent passage forming portion located on the opposite side of the vehicle body from the left and right sides. Yes.

  According to this means, it is possible to avoid an increase in intake sound due to the facing of the vent hole and the connection hole.

As one of the means for making the present invention more suitable,
An intake port that allows intake air from the foot portion of the driving unit to the storage space;
The partition wall is formed by bending a sound insulation wall extending rearward and upward from the lower edge portion of the inner peripheral edge forming the vent hole.

According to this means, it is possible to suppress an increase in intake sound and leakage of the intake sound from the intake port due to the linear ventilation path extending from the intake port at the foot portion to the vent hole of the partition wall.
In addition, by effectively using the steel plate part on the right side of the partition wall, which is unnecessary when forming the air holes, as a sound insulation wall, the structure can be simplified by reducing the number of parts compared to the case where a separate sound insulation wall is provided. Can do.

As one of the means for making the present invention more suitable,
The center pillar includes a fifth support member made of a steel plate that rotatably supports a swing fulcrum shaft that is integrally provided at a lower portion of the accelerator lever.
The swing fulcrum shaft has a small diameter portion formed at an end portion, and a large diameter portion adjacent to the small diameter portion,
The fifth support member is bent and formed in a U-shape in which a first support plate portion that rotatably supports the small diameter portion and a second support plate portion that rotatably supports the large diameter portion are opposed to each other. , Welded to the lateral outer surface of the third support member,
The first support plate part is formed with a round hole into which the small diameter part is inserted,
The second support plate portion is formed with a first recess into which the large diameter portion is inserted,
The first recess has a hole-shaped portion having substantially the same diameter as the large-diameter portion, and a slit portion extending from one end edge of the second support plate portion to the hole-shaped portion,
The slit portion has a slit width that is substantially the same width as the diameter of the small-diameter portion, and allows the small-diameter portion to be inserted.

  According to this means, the center pillar can function as a support member that supports the accelerator lever. Thereby, compared with the case where the support member only for an accelerator lever is provided separately, the center pillar can be multi-functional while simplifying the configuration by reducing the number of parts.

  Further, by bending the fifth support member into a U shape, the configuration can be simplified by reducing the number of parts compared to the case where the first support plate portion and the second support plate portion are individually provided. However, the accelerator lever can be supported with good stability by two-point support of the first support plate portion and the second support plate portion.

  And the assembly with respect to the 5th support member of the accelerator lever with which the rocking | fluctuation fulcrum shaft was integrally formed can be easily performed from the right outer side of the 5th support member using the 1st recessed part of a 2nd support plate part. it can.

As one of the means for making the present invention more suitable,
The swing fulcrum shaft includes a friction-type holding mechanism that holds the accelerator lever at an arbitrary operation position,
The holding mechanism includes a male screw portion formed in the small diameter portion, a receiving member fixed at a predetermined position of the small diameter portion, and the small diameter portion between the receiving member and the first support plate portion. A cylindrical shape that is positioned between the elastic member externally fitted to the external thread, a second nut attached to the male screw portion, and the receiving member and the second nut to set a tightening limit position of the second nut Spacers.

According to this means, the operator, for example, externally fits the elastic body and the spacer at a predetermined position of the swing fulcrum shaft to which the receiving member is fixed, and then moves the swing fulcrum shaft to the round hole of the fifth support member. By inserting into the slit part and tightening the second nut from the lower end to the tightening limit position limited by the spacer on the swing fulcrum shaft after insertion, from the deformation of the elastic body accompanying this tightening operation The frictional holding force with respect to the obtained accelerator lever can be easily set to a predetermined appropriate value.
That is, the holding mechanism can be easily and reliably assembled in a state where the friction holding force with respect to the accelerator lever is set to a predetermined appropriate value.

As one of the means for making the present invention more suitable,
A constant speed setting lever disposed adjacent to the accelerator lever;
The accelerator lever has a swing fulcrum shaft that is set up and down, and extends from the swing fulcrum shaft laterally outward of the fifth support member and is linked to the speed control lever of the prime mover unit. With a moving arm,
In the fifth support member, the first support plate portion is positioned on the lower side, the second support plate portion is positioned on the upper side, and the intermediate plate portion extends between the first support plate portion and the second support plate portion. Is set at the rear end of the fifth support member,
The first support plate part has the round hole formed in the rear part thereof, and a stopper for receiving the swinging arm at a front idling position at a front side of the round hole, the round hole, and the round hole A second recess allowing the arrangement of the constant speed setting lever between the stopper and the stopper,
The second support plate portion has the first recess formed in the rear portion thereof, and a guide hole that restricts the movement of the constant speed setting lever at a position in front of the first recess.
The intermediate plate portion includes a third recess that allows the swinging displacement of the swinging arm to a retracted position set behind the swinging fulcrum shaft.

  According to this means, the fifth support member serves both as a restricting member that restricts the forward swing of the accelerator lever from the idling position and a guide member that restricts the movement of the constant speed setting lever. Compared with the case where the guide member and the guide member are individually provided, the center pillar can be multi-functional while simplifying the configuration by reducing the number of parts.

In addition, when the operator performs an attaching / detaching operation with respect to a predetermined assembly position of the cover panel covering the swing arm or the like from behind, the operator operates the accelerator lever to position the swing arm at the retracted position. The amount of protrusion of the arm from the fifth support member to the left can be reduced.
Thus, it is possible to avoid a possibility that it becomes difficult to attach and detach the cover panel to a predetermined assembly position when the cover panel is attached / detached.

As one of the means for making the present invention more suitable,
The center pillar includes a fifth support portion that supports electrical components disposed around the center pillar.

  According to this means, the center pillar can be made to function as a support member that supports the electrical components disposed around the center pillar. As a result, it is possible to simplify the configuration by reducing the number of parts as compared with the case where a support member dedicated to electrical components is provided.

It is a left view of a tractor. It is a top view of a tractor. It is a vertical left side view of the principal part showing the configuration of the center pillar and its peripheral part. It is a vertical right view of the principal part which shows the structure of a center pillar and its peripheral part. It is a vertical rear view of the principal part which shows the structure of a center pillar and its peripheral part. It is a perspective view of the principal part which shows the structure of the mounting base regarding the attachment or detachment of a transmission shaft, and its periphery. It is a cross-sectional top view of the principal part which shows the structure of a center pillar and its peripheral part. It is a perspective view of the principal part which shows the structure of the front upper part of a center pillar, and its peripheral part. It is a perspective view of the principal part which shows the structure of the rear side upper part of a center pillar, and its peripheral part. It is a perspective view of the principal part which shows the structure of a center pillar and its peripheral part. It is a disassembled perspective view of the radiator and under panel with respect to a center pillar. It is a perspective view of the principal part which shows the structure of a center pillar, and the seal structure by the left and right leaf | plate springs of a center pillar and a bonnet. It is the perspective view which decomposed | disassembled some center pillars. It is a perspective view of the principal part which shows structures, such as a center pillar and an accelerator lever. It is a disassembled perspective view of the center pillar and bottom plate which were decomposed | disassembled into the front part side and the rear part side. FIG. 5 is a longitudinal rear view of the main part showing the upper structure of the center pillar and the state before the bonnet is fixed and held by the lock mechanism. It is a vertical rear view of the principal part showing the upper structure of the center pillar and the fixed holding state and the fixed released state of the bonnet by the lock mechanism. It is a disassembled perspective view of the principal part which shows the structure of the upper part of a center pillar, and a lock mechanism. It is a perspective view of the principal part which shows structures, such as a 5th supporting member and an accelerator lever. It is a perspective view of the principal part which shows the structure of a 5th supporting member. It is a vertical right view of the principal part which shows the structure of a friction-type holding mechanism. It is a cross-sectional top view of the principal part which shows the seal structure of the center pillar and bonnet in another embodiment. It is a perspective view of the principal part which shows the positioning structure of the left-right direction of the bonnet with respect to the center pillar in another embodiment.

  Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

The direction indicated by the arrow F shown in FIG. 1 is the front side of the tractor, and the direction indicated by the arrow U is the upper side of the tractor.
2 is the front side of the tractor, and the direction indicated by the arrow L is the left side of the tractor.

  As shown in FIGS. 1 and 2, the tractor exemplified in the present embodiment is disposed on a vehicle body frame 1 that forms a framework of the vehicle body, a driving unit 2 disposed on the front side of the vehicle body, and a rear side of the vehicle body. From the transmission unit 3 and the riding-type driving unit 4, the battery 5 disposed between the driving unit 2 and the driving unit 4, the left and right front wheels 6 that can be steered and driven by the power from the driving unit 2, and the driving unit 2 Left and right rear wheels 7 driven by the power of the power, a swingable hood 8 that covers the driving unit 2, a front guard 9 made of a steel plate that is positioned immediately before the hood 8 and protects the hood 8, and the rear of the body frame 1 A protective frame 10 connected to the end, and a mower 11 disposed in the lower abdomen between the left and right front wheels 6 and the left and right rear wheels 7 are provided.

  As shown in FIGS. 1 to 6, the vehicle body frame 1 includes a base frame 12 disposed on the lower side of the vehicle body, and a center pillar extending upward from the base frame 12 between the driving unit 2 and the driving unit 4. 13, etc.

  The base frame 12 is made of steel plates that are connected to the front and rear side members 14 made of steel plates that are long in the front and rear, the steel plate front end members 15 that extend over the front ends of the left and right side members 14, and the front and rear center sides of the left and right side members 14 The top plate 16 is provided. In the base frame 12, a space 17 for arranging a driving portion is formed between the front end member 15 and the front end of the top plate 16. The top plate 16 is bent so that the front side located on the front side of the vehicle body from the lower side of the radiator 20 is inclined downward toward the lower side of the driving unit 2.

  As shown in FIGS. 1 and 3 to 7, the driving unit 2 includes a water-cooled engine 18 that is supported by vibration isolation on the front side of the body frame 1, a radiator 20 that is disposed immediately before the center pillar 13, and an engine 18. And a cooling fan 21 disposed immediately before the radiator 20 and an air cleaner 22 disposed in front of the radiator 20 and above the cooling fan. The prime mover unit 2 is stored in a storage space formed in the front portion of the vehicle body.

  As shown in FIGS. 1, 3 to 5, and 7, the storage space is U-shaped in a plan view that covers the rear-opening bonnet 8, the bottom panel 24 disposed below the battery 5, the battery 5, and the like from the rear. The under panel 25 and the upper panel 26 that covers the upper part of the center pillar 13 and the like from above are formed.

  As shown in FIGS. 1, 3, 4, and 7, the bonnet 8 has a closed position that covers the prime mover unit 2 with a left and right support shaft (not shown) positioned at the lower front end of the vehicle body as a fulcrum. It swings up and down over the open position where the driving unit 2 is exposed. The bonnet 8 includes a first exhaust portion 8A that allows exhaust from the storage space to the front of the vehicle body, and left and right second exhaust portions 8B that allow exhaust from the storage space to the outside of the vehicle body. The under panel 25 includes an intake port 25A that allows intake air from the foot portion of the operation unit 4 to the storage space, and a dust-proof screen 25B that covers the intake port 25A.

  As shown in FIG. 1, the transmission unit 3 includes a hydrostatic continuously variable transmission (hereinafter referred to as HST) 28 used as a main transmission, and a transmission case (hereinafter referred to as T / T) connected to the rear surface of the HST 28. 29, etc.). Although not shown, the T / M case 29 includes a gear type continuously variable transmission used as an auxiliary transmission, a differential for a rear wheel, a front wheel clutch that intermittently transmits power to the left and right front wheels 6, and the like. Built in.

  As shown in FIGS. 1 to 5 and 8, the driving unit 4 includes a boarding step 30 supported by the base frame 12 and the like, a steering wheel 31 for steering the front wheels disposed above the battery 5, and a right side of the steering wheel 31. A display panel that displays an accelerator lever 32 disposed below, a constant speed setting lever 33 disposed adjacent to the accelerator lever 32, a shift pedal 34 disposed on a right foot portion of the driving unit 4, an engine speed, and the like. 35, and a driver's seat 36 having armrests 36A on the left and right. The boarding step 30 is formed with a concave portion 30 </ b> A that allows the center pillar 13 and the like to enter in the left and right central portions of the front portion thereof. The recess 30A is closed by a bottom panel 24 that is detachably bolted to the front portion of the boarding step 30. The shift pedal 34 includes a front pedal portion 34A for forward shift and a rear pedal portion 34B for reverse shift.

  Although not shown, the shift pedal 34 is linked to a trunnion shaft of a hydrostatic continuously variable transmission provided in the shift unit 3 via a shift operation linkage mechanism. The shift pedal 34 is urged to return to the neutral position by a neutral return mechanism. The constant speed setting lever 33 swings back and forth over a front constant speed setting position and a rear constant speed release position, with a left and right support shaft mounted on the base frame 12 as a fulcrum. The constant speed setting lever 33 is urged to return to a constant speed release position by a release return mechanism. The constant speed setting lever 33 is a saw blade-shaped first that swings integrally with the constant speed setting lever 33 when it is swung to a constant speed setting position in a forward state in which the front pedal portion 34A is depressed. The meshing member is configured to be displaced to a meshing position where meshing with the sawtooth-shaped second meshing member swinging integrally with the speed change pedal 34 is possible. In this state, when the stepping operation of the front pedal portion 34A is released, the first engagement member and the second engagement member are engaged with each other by the action of the neutral return mechanism and the action of the release return mechanism. Maintained. Thus, the driver can easily hold the shift pedal 34 at an arbitrary stepping operation position on the forward side, and can easily obtain a constant speed forward state corresponding to the holding position of the shift pedal 34. In this constant speed forward state, when the driver depresses the front pedal portion 34A, the second meshing member releases the meshing with the first meshing member, and the constant speed setting is performed by the action of the release return mechanism. The lever 33 returns to the constant speed release position. As a result, the driver can easily release the constant speed forward state.

As shown in FIGS. 3 to 5 and FIGS. 7 to 15, the center pillar 13 is made of a steel plate that divides a storage space provided in the front portion of the vehicle body into a first space on the driving portion side and a second space on the battery side in the front and rear directions. The partition wall 40, the first support member 41 made of steel plate that supports the partition wall 40 from below, the second support member 42 made of steel plate that supports the radiator 20 from below, and the third support member 43 made of steel plate that supports the steering wheel 31. , And a steel plate mounting table 44 on which the battery 5 is mounted, and the like are welded together.
With this configuration, the center pillar 13 functions as a partition wall 40 in the storage space, a support member 42 for a radiator, a support member 43 for a steering wheel, and a mounting table 44 for a battery.
Since the center pillar 13 is a steel plate integrated welded structure that does not require a mold, the center pillar 13 eliminates mold costs compared to the case where the center pillar 13 is made of, for example, aluminum die casting that requires a mold. In addition, the shape of the center pillar 13 can be easily changed in accordance with the change or addition of peripheral devices supported by the center pillar 13.
As a result, the center pillar 13 can be easily changed in shape according to the change or addition of peripheral devices supported by the center pillar 13 while reducing the manufacturing cost required for the multifunctional center pillar 13. Can be made suitable for.

As shown in FIGS. 3 to 5 and 10 to 15, the first support member 41 includes left and right connecting portions 41 </ b> A that are bolted to the base frame 12, and a front plate portion 41 </ b> B that extends upward from the left and right connecting portions 41 </ b> A. The top plate portion 41B is bent so as to have a top plate portion 41C extending rearward from the upper end of the front plate portion 41B. The left and right connecting portions 41 </ b> A function as the left and right leg portions 13 </ b> A of the center pillar 13. The front plate portion 41 </ b> B and the top plate portion 41 </ b> C are formed in a horizontally long shape having a central portion located above the base frame 12 and an extending portion extending left and right from the central portion. The front plate portion 41 </ b> B has a pair of left and right first slits 41 </ b> D that are horizontally long at the center portion thereof. The top plate portion 41 </ b> C supports the partition wall 40 by the center portion, and supports the left and right front end portions 30 </ b> B of the boarding step 30 by the left and right extending portions.
With this configuration, the first support member 41 of the center pillar 13 can be effectively used as a support member that supports the front end portion of the boarding step 30.
As a result, for example, compared with a case where a dedicated support member for supporting the front end of the boarding step 30 is newly provided in the vehicle body frame 1, the configuration can be simplified by reducing the number of parts in the vehicle body frame 1. Can do.

  The second support member 42 is a pair of left and right, and extends forward from the front plate portion 41 </ b> B of the first support member 41. The left and right second support members 42 are formed with round holes 42A for mounting rubber. As a result, the left and right second support members 42 support the radiator 20 in a vibration-proof manner via the left and right mount rubbers 50.

  The third support member 43 is a pair of left and right, and is adjacent to the rear surface on the upper side of the partition wall 40. The left and right third support members 43 are formed with trapezoidal openings 43A in order to reduce their weight.

  The mounting table 44 includes left and right connecting portions 44A that are bolted to the base frame 12, left and right side plate portions 44B extending upward from the left and right connecting portions 44A, and a top plate portion 44C that extends from the upper ends of the left and right side plate portions 44B. , Etc. are bent and formed. The left and right connecting portions 44 </ b> A function as the left and right leg portions 13 </ b> A of the center pillar 13. The top plate portion 44 </ b> C supports the battery 5 from below via the bottom panel 24. The mounting table 44 includes left and right front end portions 44D extending forward from the front end of the top plate portion 44C.

The left and right front end portions 44 </ b> D of the mounting table 44 extend forward of the first support member 41 and are also used as the second support member 42.
Thereby, compared with the case where the dedicated steel plate material which comprises the 2nd support member 42 is provided in the center pillar 13, the simplification of the structure by reduction of the number of parts in the center pillar 13 can be achieved.

The left and right front end portions 44 </ b> D are formed to have substantially the same width as the left and right first slits 41 </ b> D that can be inserted into the left and right first slits 41 </ b> D of the first support member 41. The left and right front end portions 44D extend forward of the first support member 41 by being inserted into the left and right first slits 41D.
As a result, when the first support member 41 and the mounting table 44 are welded, the operator can easily and accurately align the first support member 41 and the mounting table 44. As a result, the operator can easily weld the first support member 41 and the mounting table 44 in an appropriate positional relationship.

As shown in FIGS. 3 to 5, 7 and 10 to 15, the partition wall 40 has a frame shape in which a ventilator 40 </ b> A for a radiator is formed at the center, and from the upper edge portion of the inner periphery that forms the ventilator 40 </ b> A. An extending portion 40B extending rearward is bent. The upper portions of the left and right third support members 43 are welded to the extending portion 40 </ b> B of the partition wall 40.
That is, the steel plate portion at the center of the partition wall that is not required when forming the vent 40A is effectively used for welding with the upper portions of the left and right third support members 43, so that the partition wall 40 and the left and right third support members 43 are welded. This can be done firmly without increasing the length of the upward extension of the left and right third support members 43.

As shown in FIGS. 9 to 15, the left and right third support members 43 are positioned behind the ventilation port 40 </ b> A in an assembled posture in which their respective planes A do not face the ventilation port 40 </ b> A of the partition wall 40.
Thereby, the fall of the ventilation | gas_flowing quantity with respect to the radiator 20 by each plane A of the 3rd support member 43 on either side facing the ventilation opening 40A of the partition 40 can be prevented.

  The left and right third support members 43 have, as their plane A, an inner side surface 43B that faces the center of the left and right sides of the vehicle body and an outer side surface 43C that faces the laterally outer side of the vehicle body.

As shown in FIGS. 3 to 5, 7 and 10 to 15, the center pillar 13 includes a steel plate fourth support member 45 that supports the left and right third support members 43 while being supported by the base frame 12. I have.
The fourth support member 45 is bent and formed in an inverted U shape straddling the battery 5 from side to side in an assembly posture in which each plane A does not face the ventilation opening 40A of the partition wall 40. The left and right third support members 43 are welded to the upper surface 45 </ b> A of the fourth support member 45 at their lower ends.
As a result, the left and right third support members 43 are supported by the base frame 12 via the highly stable fourth support member 45 having a wide left-right width across the battery 5. For example, compared to the case where the left and right third support members 43 are directly supported by the base frame 12, the vertical length of the left and right third support members 43 is shortened. The strength and stability of the member 43 are increased.
As a result, the steering wheel 31 can be supported by the left and right third support members 43 with high strength and good stability.
In addition, it is possible to prevent a decrease in the amount of air flow to the radiator 20 due to each plane A of the fourth support member 45 facing the ventilation port 40A of the partition wall 40.

  The fourth support member 45 has, as its plane A, an upper surface 45A facing upward, a lower surface 45B facing downward, left and right inner surfaces 45C facing the left and right centers of the vehicle body, and laterally outward surfaces of the vehicle body. Left and right outer surfaces 45D.

As shown in FIGS. 3 to 5 and FIGS. 10 to 15, the fourth support member 45 is configured such that the right upper portion 45E adjacent to the positive terminal 5A of the battery 5 is higher than the left upper portion 45F adjacent to the negative terminal 5B of the battery 5. It is formed in the left-right asymmetric shape which leaves | separates from each terminal 5A, 5B to the vehicle body front side.
Thereby, when the battery 5 is attached to and detached from the mounting table 44 from the rear side, it is possible to prevent the disadvantage that the plus terminal 5A of the battery 5 contacts the right upper portion 45E of the fourth support member 45 and is short-circuited.

As shown in FIGS. 13 to 15, the fourth support member 45 has a slit 45 </ b> H into which the top plate portion 41 </ b> C of the first support member 41 enters the lower side of the left and right side plate portions 45 </ b> G from the front ends of the left and right side plate portions 45 </ b> G. It is formed facing backwards. In the fourth support member 45, the separation distance between the left and right side plate portions 45 </ b> G is such that the battery 5 and the top plate portion 44 </ b> C of the mounting table 44 straddle to the left and right, and the left and right inner side surfaces 45 </ b> C The length is set such that a state of surface contact with the side plate portion 44B is obtained.
As a result, when the first support member 41 and the fourth support member 45 are welded, the operator can easily and accurately align the first support member 41 and the fourth support member 45. As a result, the operator can easily weld the first support member 41 and the fourth support member 45 in an appropriate positional relationship.

As shown in FIGS. 3 to 5, 7, and 9 to 15, the center pillar 13 includes the right and left third support members from the first support member 41 in an assembly posture in which each plane A does not face the ventilation port 40 </ b> A of the partition wall 40. Forty-three steel plate left and right reinforcing members 46 are provided. The left and right reinforcing members 46 have their lower ends welded to the first support member 41 and their upper ends welded to the left and right third support members 43.
As a result, the center pillar 13 can be reinforced while preventing a decrease in the air flow rate to the radiator 20 due to the respective planes A of the left and right reinforcing members 46 facing the ventilation openings 40A of the partition wall 40.

  The left and right reinforcing members 46 have, as their plane A, an inner side surface 46A that faces the center of the left and right sides of the vehicle body and an outer side surface 46B that faces the laterally outer side of the vehicle body.

As shown in FIGS. 3 to 5, 7, and 10, the vehicle body frame 1 includes a fixing mechanism 51 that fixes the battery 5 on the mounting table. The fixing mechanism 51 includes left and right rods 52 supported by left and right side plate portions 45G, which are left and right sides of the fourth support member 45, so as to be swingable up and down, and a pressing member that is slidably mounted on the left and right rods 52. 53, and left and right nuts (first nuts) 54 attached to male threaded portions 52A formed at the free end portions of the left and right rods 52, etc. A swinging operation is possible over a fixed position where the presser member 53 is in contact with and a retracted position where the presser member 53 is located behind the lower end of the battery 5.
Thereby, when the operator fixes the battery 5 at a predetermined position on the mounting table, the operator moves the battery 5 to the predetermined position on the mounting table, and then places the fixing mechanism 51 at the fixed position. By performing the tightening operation of the left and right nuts 54, the battery 5 can be fixed at a predetermined position on the mounting table while being pressed against the mounting table 44 by the pressing member 53.
When the operator removes the battery 5 from a predetermined position on the mounting table, the operator releases the pressing of the battery 5 to the mounting table 44 by the pressing member 53 by performing a tightening release operation of the left and right nuts 54. The fixing mechanism 51 can be swung and displaced from the fixing position to the retracted position. Then, by swinging and displacing the fixing mechanism 51 to the retracted position, the battery 5 can be easily carried out from the mounting table to the rear without causing the inconvenience of the fixing mechanism 51.

As shown in FIGS. 3 to 7 and FIGS. 13 to 15, this tractor passes through the lower side of the radiator 20 and receives an input of HST as an input part of the transmission unit 3 from an output pulley 55 as an output part of the driving unit 2. A transmission shaft 56 is provided for transmission to a shaft (not shown). The center pillar 13 includes left and right leg portions 13 </ b> A supported by the top plate 16 of the base frame 12, and forms a transmission shaft arrangement space 57 between the center pillar 13 and the center pillar 13. In the top plate 16, an opening 16 </ b> A that allows the transmission shaft 56 to enter when the transmission shaft 56 is attached / detached is formed on the front side of the top plate 16 positioned below the radiator 20. The mounting table 44 is formed with a recess 44 </ b> E that allows the transmission shaft 56 to enter when the transmission shaft 56 is attached / detached from the rear end of the mounting table 44 toward the front.
With the above configuration, when the transmission shaft 56 is inserted into and removed from the space 57 between the top plate 16 and the center pillar 13, the operator can connect the opening 16 </ b> A of the top plate 16 and the recess 44 </ b> E of the mounting table 44. By using this, the posture of the transmission shaft 56 can be easily changed to the rearward rising inclination posture for insertion / removal and the horizontal posture for transmission connection without being obstructed by the top plate 16 and the mounting table 44. .
As a result, the transmission shaft 56 can be easily inserted into and removed from the space 57 between the top plate 16 and the center pillar 13 from above the top plate 16.

  Incidentally, when the transmission shaft 56 is inserted into and removed from the space 57 between the top plate 16 and the center pillar 13 described above, the battery 5, the bottom panel 24, the boarding step 30, etc. are removed from the base frame 12. 12 is opened, and the transmission connection between the output pulley 55 of the engine 18 and the input shaft of the HST and the transmission shaft 56 is released.

As shown in FIGS. 3, 4, 7, and 11 to 15, the radiator 20 includes a dust-proof net 58 that can be removed upward on the back. The partition 40 is bent and formed in a rearwardly rising posture in which a guide portion 40C that guides the dust falling downward from the dustproof net 58 to the lower side of the radiator 20 extends rearward and upward from the lower edge portion of the inner peripheral edge for the air vent. Has been.
As a result, while effectively utilizing the central steel plate portion of the partition wall 40 that is not required when forming the ventilation port 40A, dust that has fallen from the dustproof net 58 flows into the center pillar 13 from the ventilation port 40A, and is It is possible to suppress the occurrence of inconvenience that accumulates on the surface.
In addition, the lower side of the partition wall 40 can be reinforced without adding a new reinforcing member, and the strength of the center pillar 13 can be increased.

  The dust guided to the lower side of the radiator 20 by the guide portion 40C flows down from the opening 16A of the top plate 16 located below the radiator 20, or the top plate 16 inclined forward and downward below the radiator 20. By being guided to the space 17 between the front end member 15 and the front end of the top plate 16 in the base frame 12 on the front side, the air is discharged out of the vehicle.

The guide portion 40 </ b> C has a left-right width extending over the left and right side plate portions 45 </ b> G of the fourth support member 45, and is positioned above the first support member 41. In the guide portion 40C, left and right slits 40D into which front portions of the left and right reinforcing members 46 enter are formed from the rear end of the guide portion 40C toward the front. The first support member 41 has left and right second slits 41E into which the front side of the left and right reinforcing members 46 enters the opposite portions of the top plate portion 41C with the left and right slits 40D of the guide portion 40C. It is formed from the rear end toward the front.
With the above configuration, the left and right reinforcing members 46 can be constructed over the left and right third support members 43 from the top plate portion 44 </ b> C of the mounting table 44. As a result, the center pillar 13 can be more effectively reinforced by the left and right reinforcing members 46.
Further, when the operator welds the left and right reinforcing members 46 to the first supporting member 41 and the third supporting member 43, the positions of the left and right reinforcing members 46 with respect to the first supporting member 41 and the third supporting member 43, etc. Matching can be performed easily and accurately. As a result, the operator can easily weld the left and right reinforcing members 46 to the first support member 41 and the third support member 43 in an appropriate positional relationship.

As shown in FIGS. 3 to 5, 8 to 10, 13, and 15, the tractor includes a tilt unit 60 that supports the steering wheel 31 so as to be able to swing and displace in the vertical direction. The tilt unit 60 includes a swing member 62 that swings integrally with the steering wheel 31 with the left and right first support shafts 61 as fulcrums, a gas spring 63 that assists the swing operation of the swing member 62, and a swing member. An operating lever 64 that is operated over a lock position that prevents the moving member 62 from swinging up and down and a release position that allows the swinging up and down is provided. The left and right third support members 43 include first support portions 43 </ b> D that support the swing member 62 via the left and right first support shafts 61. The left third support member 43 includes a first fulcrum shaft 43E that supports the lower end portion of the gas spring 63 so as to be relatively swingable, and a second support portion 43F that supports the operation lever 64 so as to be swingable. I have.
With the above configuration, the driver can easily adjust the height of the steering wheel 31 according to the physique of the driver, etc. by performing the swinging operation of the operation lever 64 and the swinging operation of the steering wheel 31. it can.
Further, the third support member 43 of the center pillar 13 can also be used as a support member that supports the tilt unit 60. As a result, for example, as compared with a case where a dedicated support member for supporting the tilt unit 60 is newly provided, the center pillar 13 can be multi-functional while simplifying the configuration by reducing the number of parts. it can.

  Although not shown, the swing member 62 is made of a steel plate and has a U-shape having left and right side plate portions that are in surface contact with the inner side surfaces of the left and right third support members 43 and a top plate portion that extends over the left and right side plate portions. Is bent. The left and right side plate portions are swingably connected to the left and right third support members 43 via the left and right first support shafts 61 and the like. The left side plate portion includes a left and right second fulcrum shaft 62A that supports the upper end portion of the gas spring 63 so as to be relatively swingable.

As shown in FIGS. 3, 5 and 10, the gas spring 63 has an end on the piston rod side supported by the first fulcrum shaft 43E and an end on the cylinder tube side supported by the second fulcrum shaft 62A. Yes. The gas spring 63 includes a swing arm 63A that swings between a lock position that prevents the extension operation and a release position that allows the extension operation, and a spring (not shown) that urges the swing arm 63A back to the lock position. ), Etc. The operation lever 64 includes a one-piece operation piece 64A that pushes the swing arm 63A from the lock position to the release position in conjunction with the swing from the lock position to the release position.
With the configuration described above, the swinging arm 63A swings from the locked position to the released position against the action of the spring in conjunction with the operation when the operation lever 64 is manually operated from the locked position to the released position. Dynamic displacement. This swing displacement allows the gas spring 63 to extend and contract, and the height of the steering wheel 31 can be adjusted.
When the manual operation to the release position of the operation lever 64 is released, the swing arm 63A swings back to the lock position from the release position by the action of the spring, and the return lever swings the operation lever 64 to the release position. Swing back to the locked position. This return swing prevents the gas spring 63 from expanding and contracting, and the steering wheel 31 can be fixedly held at an arbitrary height position.

The operation lever 64 is supported by the left first support shaft 61 so as to be relatively swingable.
Thereby, the number of parts required for the configuration of the tilt unit 60 can be reduced as compared with the case where a dedicated support shaft for supporting the operation lever 64 is provided.
Further, since the first support portion 43D also serves as the second support portion 43F, the center pillar 13 can be multi-functional while simplifying the configuration of the center pillar 13 and the like.

  As shown in FIG. 3, the third support member 43 on the left side includes a left and right stopper pin 43 </ b> G that limits the swing range of the operation lever 64. The operating lever 64 is formed with a longitudinal hole 64B in the front-rear direction into which the stopper pin 43G is inserted. In the operation lever 64, the operation position on the front side where the front end portion of the inner peripheral edge forming the elongated hole 64B contacts the stopper pin 43G is set to the lock position, and the rear end portion of the inner peripheral edge contacts the stopper pin 43G. The operation position on the side is set to the release position.

As shown in FIGS. 3 to 5 and FIG. 10, the tractor includes a fully hydraulic power steering unit (hereinafter referred to as a PS unit) 65. The PS unit 65 includes a hydraulic control unit 66 supported by the swing member 62 of the tilt unit 60, a hydraulic hose 67 connected to the hydraulic control unit 66, and a metal hydraulic pipe 68 connected to the hydraulic hose 67. Etc. The center pillar 13 is provided with a rubber holder 69 for holding the hydraulic pipe 68 at the lower end thereof.
With the above configuration, resonance of the hydraulic pipe 68 can be prevented.
Further, the connecting portion between the hydraulic hose 67 and the hydraulic pipe 68 can be set at a low position away from the hydraulic control unit 66, so that the swing member of the hydraulic control unit 66 can be adjusted when the height of the steering wheel 31 is adjusted. The length of the hydraulic hose 67 allowing the integral swinging with the 62 can be increased. As a result, the height adjustment range of the steering wheel 31 can be widened.

  The PS unit 65 includes a double-action steering cylinder (not shown) that steers the left and right front wheels 6. The PS unit 65 is a hydraulic hose 67, one oil supply hose for guiding oil from a hydraulic pump (not shown) to the hydraulic control unit 66, and two oil supply / discharge oil hoses extending between the hydraulic control unit 66 and the steering cylinder. And one oil drain hose for guiding the oil from the hydraulic control unit 66 to the T / M case 29. The PS unit 65 is connected to an oil supply hose as a hydraulic pipe 68 and is connected to an oil supply hose to guide oil from the hydraulic pump to the oil supply hose. / M A single oil drain pipe that guides the inside of the case 29 is provided.

As shown in FIGS. 3, 5, 10 to 13 and 15, the center pillar 13 includes a mounting portion 13 </ b> C in which a long hole 13 </ b> B for positioning is formed at the lower end portion of the center pillar 13. The holder 69 has left and right fitting grooves 69A into which the hydraulic pipe 68 is fitted from above, and a protrusion 69B to be fitted into the long hole 13B from above at the bottom.
Thereby, when the operator assembles the hydraulic pipe 68 at a predetermined position of the center pillar 13, the holder 69 is moved in the horizontal direction by fitting the protrusion 69 </ b> B of the holder 69 into the elongated hole 13 </ b> B of the mounting portion 13 </ b> C. It can be mounted on the mounting portion 13C in a state where the displacement to is prevented. Then, after the placement, the protrusion 69B of the holder 69 can be prevented from coming off from the long hole 13B of the placement portion 13C by fitting the hydraulic pipe 68 into each fitting groove 69A of the holder 69 from above.
As a result, it is possible to fix and hold the hydraulic pipe 68 at a predetermined position of the center pillar 13 in a state in which resonance is prevented by the holder 69 while improving the assembling property of the hydraulic pipe 68.

In the center pillar 13, the fourth support member 45 is formed by bending the left and right supported portions 45K supported by the base frame 12 via the left and right connecting portions 44A of the mounting table 44 at the lower ends of the left and right side plate portions 45G. Has been. The left supported portion 45K also serves as the holder mounting portion 13C.
As a result, the center pillar 13 can be multi-functional while simplifying the configuration by reducing the number of parts as compared with the case where the center pillar 13 is provided with a dedicated part for mounting the holder.

As shown in FIGS. 5 and 7 to 15, the center pillar 13 includes left and right side walls 47 made of steel plates disposed on the left and right sides of the partition wall 40. The left and right side walls 47 have their lower ends welded to the first support member 41, and their inner side surfaces 47 </ b> A are welded to the lateral ends of the partition wall 40.
Thereby, the strength of the center pillar 13 can be increased.

As shown in FIGS. 5, 7 and 10 to 15, the left and right side walls 47 have left and right steel plate bent and formed in a U-shape that forms a longitudinal slit 47 </ b> C between the outer side surfaces 47 </ b> B. The positioning member 48 is welded. The under panel 25 includes a vertically long insertion portion 25C that is inserted into the left and right slits 47C at the left and right front ends.
With the above configuration, when the operator assembles the under panel 25 at a predetermined assembling position, the operator inserts the left and right insertion portions 25C of the under panel 25 into the slits 47C of the left and right side walls 47, whereby the under panel 25 It is possible to easily perform positioning with respect to the predetermined assembly position.
Further, since the left and right side walls 47 of the center pillar 13 also serve as positioning members for the under panel 25, the center pillar 13 can be multifunctional.

The left and right positioning members 48 have their upper end portions 48A inclined rearwardly and their lower end portions 48B inclined rearwardly, and the inner surface of the upper end portion 48A and the inner surface of the lower end portion 48B define the insertion portion 25C. It is formed on a first guide surface that guides positioning in the vertical direction.
Thus, the operator can easily and accurately position the under panel 25 in the vertical direction with respect to a predetermined assembly position.

The left and right positioning members 48 are inclined so that the intermediate portion 48C is further away from the side wall 47 toward the rear side, and the inner surface of the intermediate portion 48C is formed as a second guide surface that positions and guides the insertion portion 25C in the left-right direction. ing.
Thus, the operator can easily and accurately position the under panel 25 in the left-right direction with respect to a predetermined assembly position.

  The left and right insertion portions 25C are chamfered at both the upper and lower ends of their front ends. Accordingly, the left and right insertion portions 25C can be easily inserted into the left and right slits 47C.

As shown in FIGS. 7 and 12, the bonnet 8 has left and right inner surfaces that are in surface contact with the outer surfaces 47B of the left and right side walls 47 across the upper and lower end portions of the left and right side walls 47 at the closed position of the bonnet 8. The leaf spring 70 is provided. The left and right leaf springs 70 are formed such that their rear end edge portions 70A are located on the laterally outer side of the vehicle body toward the rear side.
With the above configuration, when the bonnet 8 is closed, the rear end edges 70A of the left and right leaf springs 70 come into contact with the outer surfaces 47B of the left and right side walls 47, whereby the bonnet 8 is positioned in the left-right direction with respect to the center pillar 13. Can be done.
In the closed position of the bonnet 8, the left and right leaf springs 70 are in surface contact with the left and right side walls 47 as described above. The possibility that an unnecessary gap is formed between the side wall 47 and the side wall 47 can be avoided over a long period of time.

As shown in FIGS. 3, 4, and 8, the upper panel 26 is covered from above with a rear end portion 8 </ b> C of the bonnet 8 in which the front end portion 26 </ b> A is in the closed position. In the center pillar 13, the upper portion of the partition wall 40 is inscribed in the front end portion 26 </ b> A of the upper panel 26.
For example, the front end of the upper panel 26 and the rear end of the partition 40 are adjacent to each other in the front-rear direction, and the front end of the partition 40 and the rear end of the bonnet 8 at the closed position are adjacent to each other in the front-rear direction. If it comprises, in order to make the clearance gap between those adjacent end surfaces look beautiful and constant, it will be necessary to make the finishing precision of those adjacent end surfaces high.
In contrast to this comparative configuration, in the configuration of the present embodiment, the gap between the adjacent end surfaces is not visible from the outside, so that the appearance of the vicinity of the rear end of the bonnet 8 is improved without increasing the finishing accuracy of the adjacent end surfaces. Can do.

As shown in FIGS. 3, 5, and 8 to 18, the tractor includes a lock mechanism 71 that fixes and holds the bonnet 8 in the closed position. The lock mechanism 71 includes a hook member 72 that swings between a lock position and a release position, a spring 73 that urges the hook member 72 back to the lock position, and a swing of the hook member 72 that resists the action of the spring 73 to the release position. An operation rod 74 that enables operation, a rod 75 on which the hook member 72 at the lock position is hooked, and the like are provided. The partition wall 40 includes a third support portion 40E that supports the hook member 72 and the spring 73, and a fourth support portion 40F that supports the operation rod 74 so that the operation rod 74 can be operated.
That is, since the partition wall 40 of the center pillar 13 also serves as a support member for the lock mechanism 71, compared with a case where a support member dedicated to the lock mechanism is individually provided, while simplifying the configuration by reducing the number of parts, It is possible to further increase the functionality of the center pillar 13.

  The hook member 72 is attached to the left and right center portion of the third support portion 40E by a stepped bolt 76 that is a front-rear direction serving as a swing fulcrum thereof. The hook member 72 includes a linkage portion 72 </ b> A that enables a swing operation to the release position by the rod 75 at an upper portion thereof. The spring 73 is installed on the hook member 72 from the right end portion of the third support portion 40E. The operation rod 74 is supported by the fourth support portion 40F so as to be slidable in the left-right direction. The right end of the operation rod 74 is connected to the hook member 72. The operation rod 74 has a left end protruding upward from a through hole 26B formed in the left end of the upper panel 26, and an operation grip 77 is mounted on the left end. The rod 75 is fixed to the left and right central portion of the rear end upper portion of the bonnet 8.

  The partition wall 40 is formed with a recess 40 </ b> G that allows the hook portion 75 </ b> A to be inserted / removed when the bonnet 8 is swung in the left / right center portion. The upper panel 26 has a concave portion 26 </ b> C that allows the hook portion 75 </ b> A to pass through the swing operation of the bonnet 8 in the left and right central portion of the upper panel 26. The bonnet 8 includes left and right compression springs 78 received and supported by the center pillar 13 via the upper panel 26.

With the above configuration, when the lock mechanism 71 is manually operated to the closed position of the bonnet 8, the rod 75 and the left and right compression springs 78 swing downward along with the bonnet 8. Then, when the left and right compression springs 78 come into contact with the upper panel 26 by this downward swing, an artificial operation to the closed position of the bonnet 8 against the action of the left and right compression springs 78 is performed, and the rod 75 is hooked. When the portion 75A comes into contact with the linkage portion 72A of the hook member 72, the hook member 72 retreats and swings from the lock position to the release position against the action of the spring 73 along with this contact. Thereafter, when the bonnet 8 reaches the closed position, the hook portion 75A of the rod 75 moves below the linkage portion 72A, and the hook member 72 is moved by the action of the spring 73 in conjunction with this movement. It returns to the locked position and is hooked on the hook 75A of the rod 75. Thereby, the lock mechanism 71 can fix and hold the bonnet 8 in the closed position. In the state where the bonnet 8 is fixedly held at the closed position, it is possible to prevent the rear end portion of the bonnet 8 from shaking due to the action of the left and right compression springs 78.
In addition, when a manual operation to the left of the operation rod 74 is performed, the lock mechanism 71 causes the hook member 72 to retreat and swing to the release position against the action of the spring 73. As a result, the lock mechanism 71 releases the fixed holding of the bonnet 8 at the closed position. Then, with this release, the left and right compression springs 78 push the bonnet 8 upward from the closed position and hold it in the unlocked position slightly above the closed position. As a result, the bonnet 8 remains in the closed position even after the unlocking operation of the lock mechanism 71, and the bonnet 8 is again moved by the lock mechanism 71 along with the return of the hook member 72 to the locked position after the release operation. It is possible to prevent the inconvenience of being fixedly held in the closed position.

  The third support portion 40E is made of a steel plate, and is bolt-connected to U-shaped left and right support tools 40H welded to the upper end portion of the partition wall 40. The fourth support portion 40F is made of a steel plate and is welded to the left end portion of the upper end portion of the partition wall 40.

The partition wall 40 is provided with left and right connecting portions 40K that enable the upper panel 26 to be bolted to the partition wall 40 at a position laterally outside the left and right support tools 40H at the upper end portion thereof.
That is, since the partition 40 of the center pillar 13 also serves as a support member for the upper panel 26, the center pillar 13 can be further multifunctional.

The fourth support portion 40F is integrally formed with the left connecting portion 40K of the left and right connecting portions 40K to which the upper panel 26 is connected.
Thereby, compared with the case where the 4th support part 40F and the left connection part 40K are provided in the partition 40 separately, simplification of the structure by reduction of a number of parts, etc. can be achieved.

  The left and right connecting portions 40K are formed in the same shape for both left and right. Thereby, compared with the case where the left and right connecting portions 40K are formed in different shapes dedicated to the left and right, it is possible to reduce costs and facilitate parts management by reducing the types of components.

As shown in FIGS. 3, 4 and 7 to 18, the driving unit 2 includes a fan shroud 79 extending from the partition wall 40 to the cooling fan 21. The fan shroud 79 has an air passage forming portion 79 </ b> A that forms an air passage 80 between the fan shroud 79 and the upper portion of the partition wall 40. The partition wall 40 is formed with a rectangular ventilation hole 40 </ b> L that allows air to flow into the ventilation path 80 on the right end side of the upper part thereof. The air passage forming portion 79A is formed with a connection hole 79B that connects the air passage 80 to the air intake portion 22A of the air cleaner 22 on the left end side of the air passage forming portion 79A located on the left and right opposite sides of the vehicle body with respect to the air vent 40L. Yes.
With the above-described configuration, it is possible to avoid an increase in intake sound due to the air hole 40L and the connection hole 79B facing each other.

The partition wall 40 is formed by bending a sound insulating wall 40M extending rearward and upward from the lower edge portion of the inner peripheral edge forming the vent hole 40L.
As a result, an increase in intake sound due to the linear passage of the air passage from the air inlet 25A of the under panel 25 to the air hole 40L of the partition wall 40 and the leakage of the air intake sound from the air inlet 25A are suppressed. Can do.
Further, by effectively using the steel plate portion on the right side of the partition wall, which is not required when forming the air holes 40L, for the sound insulation wall 40M, the configuration is simplified by reducing the number of parts compared to the case where the sound insulation wall 40M is provided as a separate member. Can be achieved.

As shown in FIGS. 3, 4, and 8, the bonnet 8 closes a gap formed between the bonnet 8 and the upper end of the fan shroud 79 at the closed position of the bonnet 8 on the inner surface of the rear end 8 </ b> C. A seal member 81 is provided.
Thereby, it is possible to prevent the air flowing through the air passage 80 described above from leaking from the gap between the bonnet 8 and the upper end portion of the fan shroud 79.

As shown in FIGS. 4, 5, 9, 12 to 15, 19, 20, and 21, the center pillar 13 is a swing fulcrum shaft 82 that is integrally formed vertically below the accelerator lever 32. Is provided with a fifth support member 49 made of a steel plate for rotatably supporting the. The swing fulcrum shaft 82 has a small-diameter portion 82A formed at the lower end portion and a large-diameter portion 82B adjacent above the small-diameter portion 82A. The fifth support member 49 has a lower first support plate portion 49A that rotatably supports the small-diameter portion 82A and an upper second support plate portion 49B that rotatably supports the large-diameter portion 82B. It is bent into a letter shape and welded to the outer side surface 43 </ b> C of the left third support member 43. The first support plate portion 49A has a round hole 49C into which the small diameter portion 82A is inserted. The second support plate portion 49B is formed with a first recess 49D into which the large diameter portion 82B is inserted. The first concave portion 49D has a hole-shaped portion 49Da having substantially the same diameter as the large-diameter portion 82B, and a slit portion 49Db extending from the right end edge of the second support plate portion 49B to the hole-shaped portion 49Da. The slit portion 49Db has a slit width that is substantially the same as the diameter of the small-diameter portion 82A, and allows the small-diameter portion 82A to be inserted.
With the above configuration, the center pillar 13 can function as a support member that supports the accelerator lever 32. Thereby, compared with the case where the support member only for an accelerator lever is provided separately, the center pillar 13 can be further multifunctional while simplifying the configuration by reducing the number of parts.
Further, by forming the fifth support member 49 in a U shape, the configuration is simplified by reducing the number of parts compared to the case where the first support plate portion 49A and the second support plate portion 49B are individually provided. The accelerator lever 32 can be supported with good stability by the two-point support of the first support plate portion 49A and the second support plate portion 49B.
The accelerator lever 32 integrally formed with the swing fulcrum shaft 82 is assembled to the fifth support member 49 by using the first concave portion 49D of the second support plate portion 49B. Can be easily done.

As shown in FIGS. 4, 5, 19, and 21, the swing fulcrum shaft 82 includes a frictional holding mechanism 83 that holds the accelerator lever 32 at an arbitrary operation position. The holding mechanism 83 includes a male screw portion 82C formed in the small diameter portion 82A of the swing fulcrum shaft 82, a receiving member 84 fixed to a predetermined position of the small diameter portion 82A, the receiving member 84 and the fifth support member 49. The elastic body 85 that is externally fitted to the small diameter portion 82 </ b> A between the first support plate portion 49 </ b> A, the nut (second nut) 86 that is attached to the male screw portion 82 </ b> C, and the position between the receiving member 84 and the nut 86. And a cylindrical spacer 87 for setting the tightening limit position of the nut 86.
With this configuration, the operator, for example, externally fits the elastic body 85 and the spacer 87 to a predetermined position of the swing fulcrum shaft 82 to which the receiving member 84 is fixed, and then moves the swing fulcrum shaft 82 to the fifth support member. 49, the nut 86 is inserted into the swing fulcrum shaft 82 from the lower end to the tightening limit position limited by the spacer 87, and then tightened. The frictional holding force with respect to the accelerator lever 32 obtained from the deformation of the elastic body 85 accompanying the operation can be easily set to a predetermined appropriate value.
That is, the holding mechanism 83 can be easily and reliably assembled in a state where the friction holding force with respect to the accelerator lever 32 is set to a predetermined appropriate value.

  The holding mechanism 83 includes a plurality of disc springs as the elastic body 85. The holding mechanism 83 includes a washer 88 between the nut 86 and the spacer 87. The holding mechanism 83 prevents loosening by attaching two nuts 86 to the male screw portion 82C.

The receiving member 84 also serves as the swing arm 90 of the accelerator lever 32 that is linked to the speed control lever (not shown) of the engine 18 via the control cable 89.
Thereby, compared with the case where the receiving member 84 and the rocking | fluctuation arm 90 are provided separately, the simplification of the structure by reduction of a number of parts, etc. can be achieved.

The receiving member 84 is fixed to the swing fulcrum shaft 82 by being welded to a predetermined position of the swing fulcrum shaft 82. In the fifth support member 49, the separation distance between the upper surface of the first support plate portion 49 </ b> A and the lower surface of the second support plate portion 49 </ b> B at the support portion of the swing fulcrum shaft 82 is a predetermined position from the lower end of the swing fulcrum shaft 82. It is formed so as to be longer than the length over the upper end of the receiving member 84 fixed to.
Thereby, the assembly using the first recess 49D of the second support plate portion 49B from the right outer side to the fifth support member 49 of the swing fulcrum shaft 82 to which the receiving member 84 is welded is possible.

As shown in FIGS. 19 and 20, the swing arm 90 extends from the swing fulcrum shaft 82 to the right outside of the fifth support member 49. The fifth support member 49 is set such that an intermediate plate portion 49E extending between the first support plate portion 49A and the second support plate portion 49B is located at the rear end of the fifth support member 49. The first support plate portion 49A has a round hole 49C formed in the rear portion thereof, and a stopper 49F for receiving the swing arm 90 at a front idling position at a position ahead of the round hole 49C, and the round hole 49C. And a second recess 49G that allows the constant speed setting lever 33 to be disposed between the stopper 49F and the stopper 49F. The second support plate portion 49B has a first recess 49D formed in the rear portion thereof, and a guide hole 49H that restricts the movement of the constant speed setting lever 33 at a position in front of the first recess 49D. The intermediate plate portion 49 </ b> E includes a third recess 49 </ b> K that allows the swinging displacement of the swinging arm 90 to the retracted position set behind the swinging fulcrum shaft 82.
In the above configuration, the fifth support member 49 serves both as a restricting member that restricts the forward swing of the accelerator lever 32 from the idling position and a guide member that restricts the movement of the constant speed setting lever 33. Compared with the case where the regulating member and the guide member are individually provided, the center pillar 13 can be further multifunctional while simplifying the configuration by reducing the number of parts.
Further, with the above-described configuration, when the operator performs attachment / detachment work with respect to a predetermined assembly position of the under panel 25 that covers the swing arm 90 and the like from the rear side, the operator operates the accelerator lever 32 to retract the swing arm 90. By positioning at the position, the protruding amount of the swing arm 90 from the fifth support member 49 to the left can be reduced.
Thereby, it is possible to prevent the under panel 25 from coming into contact with the swinging arm 90 during the attaching / detaching operation of the under panel 25 and making it difficult to attach and detach the under panel 25 to a predetermined assembly position.

  The swing arm 90 is provided with a link portion 90A linked to the speed control lever at its right extension end, and a contact arm portion 90B extending forward from the middle of the extension in a T-shape in plan view. It is formed in a shape. The swing arm 90 is set so that the contact arm portion 90B contacts the stopper 49F at the idling position of the accelerator lever 32. When the swing arm 90 is in the retracted position, the linkage portion 90A and the contact arm portion 90B are positioned behind the swing support shaft 82, and the amount of protrusion to the left from the fifth support member 49 is reduced. Is set to

  The guide hole 49H of the fifth support member 49 allows back and forth swinging between the constant speed release position and the constant speed setting position of the constant speed setting lever 33, and swings backward from the rear constant speed release position. And a long hole in the front-rear direction that prevents the rocking forward from the front constant speed setting position.

As shown in FIGS. 3 to 5, 9, and 11 to 15, the center pillar 13 includes a fifth support portion 13 </ b> D that supports the electrical component B.
Thereby, the center pillar 13 can be made to function as a support member which supports the electrical component B arrange | positioned in the periphery. As a result, it is possible to simplify the configuration by reducing the number of parts as compared with the case where a support member dedicated to electrical components is provided.

  The center pillar 13 includes left and right first support steel plates 91 that support the display panel 35 that is an example of the electrical component B as the fifth support portion 13D. The left and right first support steel plates 91 are bolted at their lower end portions to the extending portions 40 </ b> B of the partition wall 40.

  The center pillar 13 includes a second support steel plate 93 that supports a fuse box 92, which is an example of the electrical component B, as the fifth support portion 13D. The front end of the second support steel plate 93 is welded to the right end of the partition wall 40.

  As shown in FIGS. 4 and 14, the electric wire 94 for the electrical component B such as the fuse box 92 is held by the center pillar 13 via the clamp 95. The center pillar 13 is formed with a plurality of mounting holes 13E for clamping in the fourth support member 45 and the like.

[Another embodiment]
The present invention is not limited to the configuration exemplified in the above embodiment, and a typical alternative embodiment of the present invention will be exemplified below.

[1] The work vehicle may not include either one or both of the tilt unit 60 and the power steering unit 65, for example. Further, the work vehicle may include, for example, an integral type power steering unit 65.

[2] The prime mover unit 2 may be, for example, a hybrid specification in which an engine 18 and an electric motor are used together as a prime mover.

[3] The configuration and shape of the center pillar 13 can be variously changed according to changes or additions of peripheral devices supported by the center pillar 13.
For example, the center pillar 13 may be one in which the partition wall 40 and the first support member 41 are integrally formed of a single steel plate material.
For example, the center pillar 13 may include a second support member 42 formed of a dedicated steel plate material.
For example, the center pillar 13 does not include the fourth support member 45 and is formed so that the third support member 43 has a long length that is directly supported by the base frame 12 or the mounting table 44. May be.
For example, the center pillar 13 may include a fourth support member 45 formed symmetrically.
For example, the center pillar 13 may include a single reinforcing member 46 or three or more reinforcing members 46, or may include a left-right reinforcing member 46.
For example, the center pillar 13 may be provided with a guide portion 40C formed of a dedicated steel plate material or may not be provided with the guide portion 40C.
For example, the center pillar 13 may not be formed with the space 57 for the transmission shaft arrangement between the center pillar 13 and the top plate 16 of the base frame 12.
For example, the center pillar 13 may include a dedicated second support portion 43F that supports the operation lever 64.
For example, the center pillar 13 includes a holder mounting portion 13C formed of a dedicated steel plate material, a holder mounting portion 13C provided on the right side, or a holder mounting portion 13C. It may not be.
For example, in the center pillar 13, slits 47C for assembling under panels are punched and formed at both left and right ends of the partition wall 40, and positioning portions having the slits 47C punched and formed on the left and right side walls 47 are bent, Alternatively, left and right positioning members configured by punching and forming the slits 47C in a dedicated steel plate material may be provided.
For example, the center pillar 13 may be provided with the fourth support portion 40F for the operating rod and the connecting portion 40K for the upper panel individually in the partition wall 40.
For example, the center pillar 13 may include a sound insulating wall 40M formed of a dedicated steel plate material.
For example, the center pillar 13 includes a fifth support member 49 in which the first support plate portion 49A and the second support plate portion 49B are individually formed of a dedicated steel plate material, and the swing fulcrum shaft 82 is directed left and right. The thing provided with the 5th support member 49 supported by a posture, or the thing which is not provided with the 5th support member 49 may be sufficient.
For example, the center pillar 13 includes any one of a fifth support portion 13D that supports the display panel 35 and a fifth support portion 13D that supports the fuse box 92, and an electrical component disposed around the center pillar 13. B may include the fifth support portion 13D that supports the electrical component B other than the display panel 35 and the fuse box 92, or may not include the fifth support portion 13D.

[4] For example, the fifth support member 49 does not include the swing arm stopper 49F, does not include the second recess 49G for the constant speed setting lever and the guide hole 49H, or the swing arm. The third recess 49K for retraction may not be provided.

[5] The seal structure between the hood 8 in the closed position and the left and right side walls 47 of the center pillar 13 can be variously changed. Here, another embodiment of the seal structure as an example will be described with reference to FIGS. 22 and 23.
As shown in FIGS. 22 and 23, in this alternative embodiment, the left and right side walls 47 are inclined rearward so that their front end edges 47D are located on the rear side of the vehicle body as they are on the upper side. The bonnet 8 includes seal support portions 8D on the left and right inner surfaces. The left and right seal support portions 8D have rear end edges 8E that are rearwardly inclined at the same inclination angle as the front end edges 47D of the left and right side walls 47 at the closed position of the bonnet 8 and face the left and right front end edges 47D. The rear end edge 8E is equipped with left and right seal members 96 that are in line contact with the left and right front end edges 47D across the upper and lower ends of the left and right front end edges 47D at the closed position of the bonnet 8.
Accordingly, for example, the left and right side walls 47 and the bonnet at the closed position of the bonnet 8 are compared with the case where the front end edges 47D of the left and right side walls 47 and the rear end edges 8E of the left and right seal support portions 8D are provided in a vertical posture. The degree of adhesion with the left and right seal members 96 can be easily increased.
For the seal member 96, a rubber trim or the like can be used.

[6] The positioning structure in the left-right direction at the time of closing the bonnet 8 can be variously changed. Here, as an example, a positioning structure suitable for the seal structure of the other embodiment [5] will be described with reference to FIG.
As shown in FIG. 23, the center pillar 13 includes left and right guide plates 97 extending forward from the left and right side walls 47. The left and right guide plates 97 are formed to contact the left and right inner surfaces of the bonnet 8 and to guide the bonnet 8 to a predetermined position in the left-right direction when the bonnet 8 is closed.
As a result, when the bonnet 8 is closed, the left and right seal members 96 on the bonnet side can be accurately positioned at the right and left proper positions with respect to the front end edges 47D of the left and right side walls 47. As a result, the left and right sealing members 96 can be surely brought into line contact with the front end edges 47D of the left and right side walls 47.
In addition, it is desirable to employ spring steel plates for the left and right guide plates 97.

[7] The holder 69 is positioned with respect to the center pillar 13 by, for example, positioning holes formed by a plurality of positioning holes formed in the mounting portion 13C of the center pillar 13 and a plurality of protrusions formed on the bottom surface of the holder 69. You may make it carry out by insertion of each protrusion with respect to.

[8] The left and right positioning members 48 include, for example, one of a first guide surface for positioning and guiding the insertion portion 25C of the under panel 25 in the vertical direction and a second guide surface for positioning and guiding in the left and right direction. Or you may not provide both the 1st guide surface and the 2nd guide surface.

[9] The holding mechanism 83 may include a compression spring as the elastic body 85, for example. Further, the holding mechanism 83 may include, for example, a ring member formed exclusively for receiving the spacer 87 without serving as the swing arm 90 as the receiving member 84.

  The present invention includes a driving unit disposed on a front side of a vehicle body, a driving unit disposed on a rear side of the vehicle body, a battery disposed between the driving unit and the driving unit, and a lower side of the vehicle body Applied to a working vehicle such as a tractor and a riding mower, for example, provided with a base frame disposed in the center, and a center pillar extending upward from the base frame between the driving unit and the operating unit. Can do.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Driving unit 3 Transmission unit 4 Driving part 5 Battery 5A Positive terminal 5B Negative terminal 8 Bonnet 8C Rear end part 8D Seal support part 8E Rear end edge 12 Base frame 13 Center pillar 13A Leg part 13B Long hole 13C Mounting part 13D 5th support part 16 Top plate 16A Opening 20 Radiator 21 Cooling fan 22 Air cleaner 22A Intake part 25 Under panel 25A Inlet 25C Insertion part 26 Upper panel 26A Front end part 31 Steering wheel 32 Accelerator lever 33 Constant speed setting lever 40 Bulkhead 40A Ventilation opening 40B extension part 40C guide part 40E 3rd support part 40F 4th support part 40K connection part 40L ventilation hole 40M sound insulation wall 41 1st support member 42 2nd support member 43 3rd support member 43C lateral outer side surface 43D 3rd Support portion 43E Support shaft 43F Second support portion 44 Mounting base 44D Front end portion 44E Recess 45 Fourth support member 45A Upper surface 45E Left and right upper portion 45F Left and right other upper portion 46 Reinforcement member 47 Side wall 47A Inner side surface 47B Outer side surface 47C Slit 47D Front end Edge 48 Positioning member 48A Upper end portion 48B Lower end portion 48C Intermediate portion 49 Fifth support member 49A First support plate portion 49B Second support plate portion 49C Round hole 49D First recess 49Da Hole portion 49Db Slit portion 49E Intermediate plate portion 49F Stopper 49G 2nd recessed part 49H Guide hole 49K 3rd recessed part 51 Fixing mechanism 52 Rod 52A Male thread part 53 Holding member 54 1st nut 55 Output part 56 Transmission shaft 57 Space 58 Dustproof net 60 Tilt unit 61 1st spindle 62 Oscillating member 63 gas spring 64 operation Working lever 65 Power steering unit 66 Hydraulic control section 67 Hydraulic hose 68 Hydraulic pipe 69 Holder 69A Fitting groove 69B Projection 70 Leaf spring 70A Rear edge 71 Lock mechanism 72 Hook member 73 Spring 74 Operation rod 75 Rod 79 Fan shroud 79A Aeration path forming part 79B Connection hole 80 Aeration path 82 Oscillating fulcrum shaft 82A Small diameter part 82B Large diameter part 82C Male thread part 83 Holding mechanism 84 Receiving member 85 Elastic body 86 Second nut 87 Spacer 90 Oscillating arm 96 Seal member 97 Guide plate A Plane B Electrical component

Claims (30)

A vehicle body frame, a driving unit disposed on the front side of the vehicle body, a driving unit disposed on the rear side of the vehicle body, and a battery disposed between the driving unit and the driving unit,
The vehicle body frame includes a base frame disposed on a lower side of the vehicle body, and a center pillar extending upward from the base frame between the driving unit and the driving unit,
The prime mover unit includes a radiator disposed immediately before the center pillar,
The driving unit includes a steering wheel disposed above the battery,
The center pillar includes a steel plate partition that divides a storage space formed in a front portion of the vehicle body into a first space on the driving unit side and a second space on the battery side, and a steel plate that supports the partition wall from below. A first support member made of steel, a second support member made of steel plate that supports the radiator from below, a third support member made of steel plate that supports the steering wheel, and a steel plate mounting on which the battery is placed A work vehicle that is constructed as an integrated structure welded to a table.   The work vehicle according to claim 2, wherein a front end portion of the mounting table extends forward of the first support member and is also used as the second support member. The partition wall is formed in a frame shape in which a vent hole for a radiator is formed in the center, and an extension portion extending backward from an upper edge portion of an inner peripheral edge forming the vent hole is bent and formed.
The work vehicle according to claim 1 or 2, wherein an upper portion of the third support member is welded to the extension portion.   4. The work vehicle according to claim 3, wherein each of the third support members is positioned behind the ventilation port in an assembled posture in which each plane does not face the ventilation port. The center pillar includes a fourth support member made of a steel plate that supports the third support member in a state of being supported by the base frame,
The fourth support member is bent and formed in an inverted U shape straddling the battery from side to side in an assembly posture in which each plane does not face the ventilation port,
The work vehicle according to claim 3 or 4, wherein a lower end portion of the third support member is welded to an upper surface of the fourth support member.   The left and right upper portions adjacent to the positive terminal of the battery are formed in a left-right asymmetric manner in which the fourth support member is separated from each terminal toward the front of the vehicle body rather than the other left and right upper portions adjacent to the negative terminal of the battery. Item 6. The work vehicle according to Item 5. The vehicle body frame includes a fixing mechanism that fixes the battery on a mounting table,
The fixing mechanism includes left and right rods supported on both left and right sides of the fourth support member so as to be vertically swingable, a pressing member that is slidably mounted on the left and right rods, and left and right rods. Left and right nuts attached to male screw portions formed at the free end, and a fixing position where the pressing member contacts a corner of the upper front end of the battery, and the pressing member is behind the lower end of the battery The work vehicle according to claim 5 or 6, wherein a swinging operation over a retreat position located at a position is possible. The center pillar includes a steel plate reinforcing member that extends from the first support member to the third support member in an assembly posture in which each plane does not face the ventilation port.
The work vehicle according to claim 3, wherein the reinforcing member has a lower end welded to the first support member and an upper end welded to the third support member. The radiator is provided with a dustproof net that can be removed upward on the back,
The partition wall is formed by bending a guide portion for guiding dust falling downward from the dust-proof net to the lower side of the radiator so as to extend rearward and upward from a lower edge portion of the inner peripheral edge. Item 9. The work vehicle according to any one of Items 3 to 8. A transmission unit disposed on the rear side of the vehicle body, and a transmission shaft that is transmitted from the output unit of the driving unit to the input unit of the transmission unit through the lower side of the radiator,
The center pillar includes left and right legs supported by the top plate of the base frame, and forms a space for transmission shaft arrangement with the top plate,
In the top plate, an opening that allows the transmission shaft to enter when the transmission shaft is attached and detached is formed on the front side of the top plate located below the radiator,
The mounting table according to any one of claims 1 to 9, wherein a recess that allows the transmission shaft to enter when the transmission shaft is attached or detached is formed from the rear end of the mounting table toward the front. Work vehicle. A tilt unit that supports the steering wheel so as to be swingable in the vertical direction;
The tilt unit includes a swinging member that swings integrally with the steering wheel about a first support shaft that is directed to the left and right, a gas spring that assists a swinging operation of the swinging member, and a vertical movement of the swinging member. An operating lever that is operated over a locking position that prevents swinging and a release position that allows vertical swinging;
The third support member includes a first support portion that supports the swinging member via the first support shaft, a left-right fulcrum shaft that supports one end of the gas spring so as to be relatively swingable, and The work vehicle according to claim 1, further comprising a second support portion that supports the operation lever so as to be swingable.   The work vehicle according to claim 11, wherein the operation lever is supported on the first support shaft so as to be relatively swingable. It has a hydraulic power steering unit,
The power steering unit includes a hydraulic control unit supported by the swing member, a hydraulic hose connected to the hydraulic control unit, and a metal hydraulic pipe connected to the hydraulic hose,
The work vehicle according to claim 11 or 12, wherein a rubber holder that holds the hydraulic pipe is disposed at a lower end portion of the center pillar. The center pillar includes a mounting portion in which a long hole for positioning is formed at a lower end portion of the center pillar,
14. The holder according to claim 13, wherein a fitting groove into which the hydraulic pipe is fitted from above is formed on the upper surface of the holder, and a protrusion that is fitted into the elongated hole from above is formed on the bottom surface of the holder. Work vehicle. The center pillar includes left and right side walls made of steel plates disposed on the left and right sides of the partition wall,
The left and right side walls have their lower ends welded to the first support member, and their inner side surfaces welded to the lateral ends of the partition wall. Working vehicle. A U-shaped under panel in plan view that covers the battery from behind,
The left and right side walls are welded to the left and right positioning members made of steel plates bent and formed in a U shape to form a vertically long slit between the outer side surfaces thereof,
The work vehicle according to claim 15, wherein the under panel includes a vertically long insertion portion that is inserted into the slit at left and right front end portions thereof.   The left and right positioning members have their upper end portions inclined upward and rearward, and their lower end portions inclined downward and the inner surface of the upper end portion and the inner surface of the lower end portion vertically move the insertion portion. The work vehicle according to claim 16, wherein the work vehicle is formed on a first guide surface for positioning and guiding.   The left and right positioning members are inclined so that their intermediate portions are separated from the side wall toward the rear side, and the inner surface of the intermediate portion is formed as a second guide surface for positioning and guiding the insertion portion in the left-right direction. The work vehicle according to claim 16 or 17. A bonnet that swings up and down over a closed position that covers the prime mover unit and an open position that exposes the prime mover unit;
The left and right side walls are inclined rearward so that their front end edges are located on the rear side of the vehicle body,
The bonnet is provided with seal support portions on the left and right inner surfaces thereof,
The left and right seal support portions have rear end edges that are inclined rearwardly at the same inclination angle as the left and right front end edges and face the left and right front end edges in the closed position, and the left and right rear end edges, The work vehicle according to any one of claims 15 to 18, further comprising left and right sealing members in line contact with the left and right front end edges over both upper and lower end portions of the left and right front end edges in the closed position. The center pillar includes left and right guide plates extending forward from the left and right side walls,
The work according to claim 19, wherein the left and right guide plates are formed so as to contact the left and right inner surfaces of the bonnet and guide the bonnet to a predetermined position in the left-right direction when the bonnet is closed. car. A bonnet that swings up and down over a closed position that covers the prime mover unit and an open position that exposes the prime mover unit;
The bonnet includes left and right leaf springs that are in surface contact with the outer side surfaces of the left and right side walls across the upper and lower end portions of the left and right side walls at the closed position on the left and right inner surfaces thereof,
The work vehicle according to any one of claims 15 to 18, wherein the left and right leaf springs are formed such that rear end edges thereof are positioned on the laterally outer side of the vehicle body toward the rear side. An upper panel that covers the upper part of the center pillar from above;
The upper panel has its front end covered from above at the rear end of the bonnet in the closed position,
The work vehicle according to any one of claims 19 to 21, wherein the center pillar has an upper portion of the partition wall inscribed in a front end portion of the upper panel. A lock mechanism for fixing and holding the bonnet in the closed position;
The lock mechanism includes a hook member that swings between a lock position and a release position, a spring that urges the hook member back to the lock position, and the hook member that resists the action of the spring to the release position. An operation rod that enables a swing operation, and a rod on which the hook member at the lock position is hooked;
The said partition is provided with the 3rd support part which supports the said hook member and the said spring in the upper end part, and the 4th support part which supports the said operation rod so that operation is possible. The work vehicle according to one.   24. The work vehicle according to claim 23, wherein the fourth support portion is integrally formed with a connection portion to which an upper panel that covers an upper portion of the center pillar from above is connected. A cooling fan disposed immediately before the radiator, an air cleaner disposed in front of the radiator and above the cooling fan, and a fan shroud extending from the partition wall to the cooling fan,
The fan shroud has an air passage forming portion for forming an air passage between the upper portion of the partition wall and the upper portion of the partition wall,
The partition wall is formed with air holes that allow air to flow into the air passage on the left and right end sides of the upper part,
The vent passage forming portion is formed with a connection hole for connecting the vent passage to the intake portion of the air cleaner on the left and right other ends of the vent passage forming portion located on the opposite side of the vehicle body from the left and right sides. The work vehicle according to any one of claims 1 to 24. An intake port that allows intake air from the foot portion of the driving unit to the storage space;
26. The work vehicle according to claim 25, wherein the partition wall is formed by bending a sound insulation wall extending rearward and upward from a lower edge portion of an inner peripheral edge forming the vent hole. The center pillar includes a fifth support member made of a steel plate that rotatably supports a swing fulcrum shaft that is integrally provided at a lower portion of the accelerator lever.
The swing fulcrum shaft has a small diameter portion formed at an end portion, and a large diameter portion adjacent to the small diameter portion,
The fifth support member is bent and formed in a U-shape in which a first support plate portion that rotatably supports the small diameter portion and a second support plate portion that rotatably supports the large diameter portion are opposed to each other. , Welded to the lateral outer surface of the third support member,
The first support plate part is formed with a round hole into which the small diameter part is inserted,
The second support plate portion is formed with a first recess into which the large diameter portion is inserted,
The first recess has a hole-shaped portion having substantially the same diameter as the large-diameter portion, and a slit portion extending from one end edge of the second support plate portion to the hole-shaped portion,
27. The work vehicle according to any one of claims 1 to 26, wherein the slit portion has a slit width that is substantially the same as a diameter of the small-diameter portion, and allows the small-diameter portion to be inserted. The swing fulcrum shaft includes a friction-type holding mechanism that holds the accelerator lever at an arbitrary operation position,
The holding mechanism includes a male screw portion formed in the small diameter portion, a receiving member fixed at a predetermined position of the small diameter portion, and the small diameter portion between the receiving member and the first support plate portion. An elastic body that is externally fitted, a nut that is attached to the male screw portion, and a cylindrical spacer that is positioned between the receiving member and the nut to set a tightening limit position of the nut. The work vehicle according to claim 27. A constant speed setting lever disposed adjacent to the accelerator lever;
The accelerator lever has a swing fulcrum shaft that is set up and down, and extends from the swing fulcrum shaft laterally outward of the fifth support member and is linked to the speed control lever of the prime mover unit. With a moving arm,
In the fifth support member, the first support plate portion is positioned on the lower side, the second support plate portion is positioned on the upper side, and the intermediate plate portion extends between the first support plate portion and the second support plate portion. Is set at the rear end of the fifth support member,
The first support plate part has the round hole formed in the rear part thereof, and a stopper for receiving the swinging arm at a front idling position at a front side of the round hole, the round hole, and the round hole A second recess allowing the arrangement of the constant speed setting lever between the stopper and the stopper,
The second support plate portion has the first recess formed in the rear portion thereof, and a guide hole that restricts the movement of the constant speed setting lever at a position in front of the first recess.
29. The work vehicle according to claim 27 or 28, wherein the intermediate plate portion includes a third recess allowing the swing displacement of the swing arm to a retreat position set behind the swing fulcrum shaft.   The work vehicle according to any one of claims 1 to 29, wherein the center pillar includes a fifth support portion that supports electrical components disposed in the periphery of the center pillar.

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